22172149 has 2 divisors, whose sum is σ = 22172150. Its totient is φ = 22172148.

The previous prime is 22172147. The next prime is 22172159. The reversal of 22172149 is 94127122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15069924 + 7102225 = 3882^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 22172149 - 2¹ = 22172147 is a prime.

Together with 22172147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22172147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11086074 + 11086075.

It is an arithmetic number, because the mean of its divisors is an integer number (11086075).

Almost surely, 2^22172149 is an apocalyptic number.

It is an amenable number.

22172149 is a deficient number, since it is larger than the sum of its proper divisors (1).

22172149 is an equidigital number, since it uses as much as digits as its factorization.

22172149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 22172149 is about 4708.7311454361. The cubic root of 22172149 is about 280.9328960049.

The spelling of 22172149 in words is "twenty-two million, one hundred seventy-two thousand, one hundred forty-nine".